diff --git a/alsa.c b/alsa.c
index 091e301..18668c8 100644
--- a/alsa.c
+++ b/alsa.c
@@ -16,7 +16,7 @@ typedef struct {
 	void (*info)(pcm_t *);
 	int (*rate)(pcm_t *);
 	int (*channels)(pcm_t *);
-	int (*rw)(struct pcm *, short *, int);
+	int (*rw)(pcm_t *, short *, int);
 	snd_pcm_t *pcm;
 	int index;
 	int frames;
diff --git a/wav.c b/wav.c
index 6392bbb..f46153d 100644
--- a/wav.c
+++ b/wav.c
@@ -34,7 +34,7 @@ typedef struct {
 	void (*info)(pcm_t *);
 	int (*rate)(pcm_t *);
 	int (*channels)(pcm_t *);
-	int (*rw)(struct pcm *, short *, int);
+	int (*rw)(pcm_t *, short *, int);
 	void *p;
 	short *b;
 	size_t size;